Thermally-driven structural changes of graphene oxide multilayer films deposited on glass substrate.

Graphene oxide (GO) has been recognized as an important intermediate compd. for a potential low-cost large-scale graphene-like film fabrication. In this work, graphene oxide multilayer films deposited on glass substrate were reduced using different thermal redn. methods, including low-temp. annealing, flame-induced and laser redn., and the corresponding surface morphol. and structural properties were investigated. These graphene oxide thermal redn. methods strongly affected surface morphol. and differently facilitated structural and chem. transformations of graphene oxide. As evidenced by Raman measurements, thermal annealing and laser redn. of graphene oxide produced more ordered graphene-like structure multilayer films. However, surface morphol. differences were obsd. and attributed to the different de-oxidn. mechanisms of GO. This Letter provides an important systematic comparison between the GO redn. methods and thermally-driven structural changes they provide to the reduced GO multilayer films obtained. [on SciFinder(R)]